No. 2: Rosneft

Rosneft, led by Chairman Igor Sechin, is the world's largest publicly traded oil company. Rosneft's most recently published figures show 5.07 million BOE/day of production, of which 81% was oil. Rosneft produces 40% of Russia's oil -- more than any other country save Saudi Arabia and the U.S. Rosneft has an EV of $72.5 billion.